Fastening device.



f No. 746,670. BATENTEDDEG. 15, 1903.

y B. CARNDFF.

PASTENING DEVICE'. APPLIoATIoN HLBDJUM: a, 1903.

Ho nonni...

' l W/TNESSES.' I /NVf/VTH @ji/MM M Patented December I5, 1903;

PATENT @Erica EDWARD OARNDUFF, OF COLFAX, IOWA..

FSTEN'ING DEVICE.

SPECIFICATION forming part of Letters Patent No. 746,670, dated December 15, 1903.

Application tiled June 3, 1908. Serial No. 1591895. (No model.)

To @Z5 whom, t may cori/cern:

Be it known that I, EDWARD CARNDUFF, a citizen of the United States of America, anda resident of Colfax, in the'countyof Jasper and State of Iowa, have invented certain new and useful Improvements in Fastening Devices, of which the following is a specification.

My invention relates to improvements in a fastening device particularly adapted for removably securing tools or implements upon their respective handles, and l shall describe the same as applied to miners picks, which demand the frequent replacement ot' dulled or broken pick-blades upon the handles.

In my improved device I have endeavored to provide a construction that will most easily and securely mount the pick-blade or rother tool upon its handle, while avoiding the unnecessary wear ofthe threaded parts securing it in place, and preventv as well the loosening of said tool while in use, although permitting the m ost ready removal and replacement of the pick-blade.

The common mode of mounting pick-blades upon their handles is by means of screwbolts, which are inserted in tapped holes iu metallic sockets attached at the ends of said handles and adapted to receive said blades, as exemplified in Patent No. 856,412, Ydated January 18, 1887. The frequent tightening and loosening of these bolts, however, which must be completely withdrawn and reinserted each time the pick-blade is changed, wears the threads, thereby preventing 'the blade from being securelyfastened in place, and also requires more time to accomplish than is necessary. My improvements overcome these deficiencies observed in the devices of the prior art, as well as others, as will appear from the following specification.

The accompanying drawings will enable me to explain denitely my said improvements, wherein- Figure l is a side view ot' a miners pick constructed in accordance with my invention, the parts being broken away and cross-sectioned to make the details quite clear. Fig. l2 is a top view ofthe pick-blade with the fasteningbolt and washer removed. Fig. 3 illustrates in its closed position the hinged lthe several figures of the drawings.

At the outer extremity of handle h is permanently mounted the metallic socket or cap c, suitably shaped to receive the removable pick-blade p or other tool and having retainl ing-ribs c2, which enter corresponding depressions upon the under side of said blade.

A central tapped hole c3 within the socket is adapted to seat the fastening-bolt b, the hexagonal head of the latter being of sufticiently small size to pass through the vertical aperture p2 in said pick-blade and permit the removal from or the adjustment ot' said blade upon the socket. Said lboltis provided with a lower left-hand threaded portion b2, entering the tapped socket, and a slightly larger right-hand threaded portionl h3, adapted to receive the ribbed or trishouldered nut n, litting snugly within the openiugpz. Said opening, as seen in Fig. 2, is cut to conform to the nut and prevents the latter from turning with the bolt, While beneath the nut are disposed two springs s s2 of different tensions or strengths. y

Beneath the head of the bolt b is disposed the hinged washer w. (Shown in plan view in Figs. 3 and 4.) This comprises two separable hinged parts, the opening in which when the device is closed being only substantially the size of the upper portion of the bolt, and in consequence the bolt-4 head engages the upper surface of the washer, as shown in Fig. l, thereby retaining the pick-blade in position under normal conditions. At such times in order securely to retain the washer in position a pin or lug w2 is provided in each of the outer orA separable end portions of the washer, which Vpins. are adapted to enter a shallow recess p3 in the upper surface of the pick-blade. l ward turnof the boltwithin its tapped hole in the socket serves rigidly to fasten the pickblade upon the handle and securely lock the In this position `a slight down IOO washer in its closed position beneath the bolthead. This is readily accomplished by means of a small wrench applied t0 the bolt-head.

The downward movement of the bolt is magnied with respect to the nut fn, which is also forced downward upon the bolt by the larger thread cut thereon against the tension of the heavy and light springss s2, thereby compressing them beneath said nut. Similarly the pick-blade may be loosened and removed from the socket and handle by a partial reverse turn of the bolt, thus loosening the retaining part or washer w sufficiently to free the lugs or pins w"2 from the recess p3, whereupon said washer may at once be removed from beneath the bolt -head and the pick-blade may be slipped from the bolt and socket.

It will be seen that the threaded portions of the bolt and socket are subjected to a minimum of wear and are at all times in engagement throughout almost their entire length, while the removal and secure replacement of a pick-blade are very readily and easily effected.

The nut n centrally stays the pick-blade,

the opening in which it snugly tits, and under the influence of the spring-pressure it assists in retaining the bolt in its retracted position and in preventing the loosening of said bolt. Moreover, the entire device is practically integral. Hence the accidental loosening, separation, and loss of the removable parts (the retaining part or washer and the pick-blade) are rendered most unlikely.

Having now described and shown an appliance fully embodying my invention, I claim as new, and desire to secure by Letters Patent, the following:

l. The combination with a suitable socket or receptacle, of a rotatable part mounted therein, a hinged retaining part or washer,

the bolt b mounted therein, the separable retaining part or washer w, and the tool p adapted to be removably secured to the socket beneath said separable retaining part, substantially as set forth.

` 3. The combination with a handle and its l terminal socket, of a tool-fastening device comprising a threaded bolt mounted in said socket and a l separable retaining part or washer, and a removable tool suitably cut away to receive said bolt and washer, adapted to be secured to the socket beneath the washer and bolt-head, substantially as set forth.

4;. The combination with a handle and` its terminal socket, of a bolt mounted in the latter, a separable retaining-washer, and a removable' tool or part suitably cut away to receive the bolt and washer and engage the latter to prevent its accidental opening, substantially as set forth.

5. The combination with a handle and its terminal cap or socket, of a tool-fastening device comprising a threaded bolt mounted in said socket, a spring and the tension nut thereon, a removable tool or device suitably cut away to accommodate said parts, and a separable retaining part or hinged Washer adapted to engage the bolt-head and tool and secure the latter to the socket, substantially as set forth.

Signed at Colfax this 9th day of May, 1903, in the presence of two subscribing witnesses.

EDWARD CARNDUFF.

Witnesses:

J. H. HAHN, H. H. WHITTED. 

